Qualifying Therapeutic Discovery Project Program (Details Textual) (USD $)	12 Months Ended
Jul. 31, 2011
Government Grant Received	$ 488,959

Amount of grant received for the qualifying expenses that had previously incurred.

No definition available.

Name:	gnbt_GovernmentGrantReceived
Namespace Prefix:	gnbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration